用Octave求偏导数
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设\(f(x,y)=x^2+y^2，求f'_{~y}(1,2)\).
程序代码如下
function [text_result, numeric_result] = func80(x_value, y_value)
    pkg load symbolic;
    x = sym('x');
    y = sym('y');
    result = diff(x^2 + y^2, y);
    result = limit(result, x, x_value);
    result = limit(result, y, y_value);
    text_result = ["\n", disp(result)];
    numeric_result = eval(result);
endfunction
结果如下
>> [text_result, numeric_result] = func80(1, 2)
text_result =
    4

numeric_result = 4
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